Pneumothermic apparatus



A. S. SALAS.

PNEUMOTHERMIC APPARATUS.

APPLICATION FILED DEC. 27, 1920.

Patented June 7, 1921.

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uniran PNEUMOTHERMIC APPABZLTUS.

' Application filed December 27, 1920. Serial No.

T 0 all whom it may concern.

Be it known that I, Anonro SALVADOR SALAs, a citizen of the Argentine Republic, residing at calle Maipii 671, Buenos Aires, Argentina, have invented new and useful Improved Pneumothermic Apparatus, of which the following is a specification.

This invention relates to an improved pneum-o-thermic apparatus, destined to close an electric circuit for operating electric bells or other alarm devices, at the instant of a fire breaking out, said apparatus being adapted for use in work shops, playhouses, private buildings, stores, holds of ships and the like.

As will be seen by the following description, the device operates by the expansion of the air when submitted to a sudden rise of temperature. The device may so be ad justed that the sudden rise of only one degree in the temperature of :the air of the room or inclosure where the same is placed, will cause the operation of the alarm device.

Such high degree of sensitiveness ofthe apparatus, however, will not cause the operation thereof when the temperature of the air rises gradually, aswhen lighting a match or upon the operation of the usual lighting or heating appliances.

The apparatus substantially consists of a set of metallic tubes, constructed of very thin sheet metal, and communicating at their ends with chambers in turn'suitably connected to oscillatory or extensible chambers or plates, by means of which the slightest abrupt or sudden expansion .of the air-inclosed within the system, will cause the continuous operation of the device. and will simultaiieously close the electric circuit of the alarm device. v

e invention will be better understood by reference to the accompanying drawings which illustrate the preferred embodiment.

of the same, and wherein F igure 1 is an elevation, partially in central section, of a fire alarm device, constructed in accordance with my invention. Fig. 2 shows a section of the same, along the line AB of Fig. 1.

In said drawings, 1 and 2 indicate the end.- chambers, in communication one'with the other by means of a set of tubes 3 radially conducting heat. Through the said chambers and tubes, except the central tube, extend the tubes 4 through which the surrounding air may freely circulate. By this Specification of Letters Patent.

Patented June 7,1921.

arrangement, the concentric tubes form annular spaces and the air contained within these spaces is submitted to the influence of the surfaces of said tubes 3 and 4 for rapidly heating and cooling the thin annular columns of air therebetween.

The chamber 2 communicates with the extensible plates 5 arranged to contact with a screw 6, electrically insulated from the base Y of the apparatus and which may conveniently be adjusted so as to predetermine the instant at which the lower plate 5 is to come into contact with the screw and thereby close an electric circuit of which the leads 8 and 9, leadingfrom the respective terminals 10 and 11, are connected one to the said plates and the other to the screw 6.

-'lhe' chamber 1 communicates with the extensible plates 12, of which the upper one is formed with a head 13, adapted to obturate the orifice 14. of the outlet chamber 15, supported in position by an arm 16 and connected to the system by means ofthe tube 17. The orifice 14 may be adjusted as to its outlet area by means of a screw 18, conveniently arranged in the cover 19 of the chamber 15. The arm 16 is secured to one of the standards 20 by means of a nut and screw 21, so that the height may be adjusted (by washers, shims or otherwise, not shown) for the purpose of approaching at will the orifice 14 toward the obturating' head '13. The standards 20'are provided with notches wherein engage the metallic coils 22 which form a protective sheathing.

The space confined by the chambers, tubes and extensible. plates is in communication with the outer air only by means of the controllable opening it.

The operation of the device is as follows The apparatus being mounted within "a room, hold or any other desired. space, when the air is being gradually heated as by lighting a match, lamp or the like, the air con-- the action of the heat transmitted thereto by rad ' causing i116 bells or other alarm devices to sound.

I cla m:- Y

1. Fire alarm device, substantially comprising; two air chambers in communicw time one with the other by of a plurality or thin metallic tubes, concentrically arranged tubes extending througb some of the first mentioned tubes and allowing of the circulation theretbrough of the outer air, sets of pneumatic extensible plates connected to said chamber to expand at a den the temperature outside the device, causing a sudden expansion of the air contained within the same, thereby caus- 111;}; one or the sets plates, assisted also by the expansion the tubes, to obturete an exit orifice which constitutes the only conrimunicetion with the outer air, while the other set is caused to close an eleotrio circuit and operate a bell or other suitable alarm device, substantially described,

2, lo thermostatic alarm, a pension device, a passage permit enter leave said device arr? 5e opened and. closed by R11 eztpansible portion of said device and neens to regulate the discharge o l said passe to vary t is speed of closure of? said passage by said portion.

3. ln a. thermostatic alarm, an expansion chamber, a passage permitting air to enter and leave said chamber arranged to be opened. and closed by an expansible portion of said. chamber.

l In a thermostatic alarm, an expansion chamber, a, nozzle arranged opposite a Wall or said chamber and to be closed by said Well upon rapid expansion of the chamber, and means to permit relative adjustment of the nozzle andwall to and from each other.

5. In a thermostatic alarm, an expansion chamber, a. vent device normally venting said chamber to the atmosphere and arranged to be closed by an expansible portion of seid chamber, end an electric contact closed by the expansion of said chamber caused by the expansion. of the air trapped in said chamber after the closing ofsaid vent device, l

6. ln 3;. thermostatic alarm, two end chambers, tubes connectin the chambers, bellow expansion plates connected to each chamber, tnbes concentric with the store said tubes and spaced therefrom for the'pessage of outside air, tliereby forming annuler chambers containing thin annular bodies of air subjected externally and internally to temperature changes, a venting nozzle arranged opposite the expansion'plates of one chamber, a tube connectino said nozzle and e chamber, means to permit adjustment of the nozzle to and from the plates, 1 leans to adjust the area of the nozzle opening, an electrical contact opposite. the plates of the second chamber and a protector surrounding the above assemblage.

ADQLFU SALVADUR SALAS. V/itnesses:

TGUANI, A, L, BETEE; 

